Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/14034#discussion_r70033419 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/SQLQuerySuite.scala --- @@ -660,18 +660,39 @@ class SQLQuerySuite extends QueryTest with SharedSQLContext { test("limit") { checkAnswer( - sql("SELECT * FROM testData LIMIT 10"), + sql("SELECT * FROM testData LIMIT 9 + 1"), testData.take(10).toSeq) checkAnswer( - sql("SELECT * FROM arrayData LIMIT 1"), + sql("SELECT * FROM arrayData LIMIT CAST(1 AS Integer)"), arrayData.collect().take(1).map(Row.fromTuple).toSeq) checkAnswer( sql("SELECT * FROM mapData LIMIT 1"), mapData.collect().take(1).map(Row.fromTuple).toSeq) } + test("non-foldable expressions in LIMIT") { + val e = intercept[AnalysisException] { + sql("SELECT * FROM testData LIMIT key > 3") --- End diff -- A good question! : ) Now, the exception we issued is not good: ``` java.lang.Boolean cannot be cast to java.lang.Integer java.lang.ClassCastException: java.lang.Boolean cannot be cast to java.lang.Integer at scala.runtime.BoxesRunTime.unboxToInt(BoxesRunTime.java:101) ``` Let me fix it and throw a more reasonable exception: ``` number_rows in limit clause cannot be cast to integer:true; ```
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